TryGhost/Ghost

{{contrast_text_color}} helper returns incorrect text color

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#27,797 opened on May 9, 2026

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Description

Issue Summary

The {{contrast_text_color}} helper returns incorrect text color for many backgrounds due to a typo in textColorForBackgroundColor from @tryghost/color-utils.

Root cause

In @tryghost/color-utils the YIQ formula uses .b() instead of .blue():

Fix

PR submitted to TryGhost/SDK: https://github.com/TryGhost/SDK/pull/905

Steps to Reproduce

Use light color with the {{contrast_text_color}} helper — the returned contrast color will be white instead of black.

For example: #dacafe, #ffa5b1, #a3e6ff

Ghost Version

6.37.1

Node.js Version

v22.13.1

How did you install Ghost?

localhost

Database type

SQLite3

Browser & OS version

No response

Relevant log / error output

Code of Conduct

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Contributor guide

Research direction
Apply the fix from PR #905 in TryGhost/SDK by replacing `.b()` with `.blue()` in `textColorForBackgroundColor`.
Tech stack
javascriptnodejs
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJavaScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90